tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef __LINUX_SWIOTLB_H
2#define __LINUX_SWIOTLB_H
3
4#include <linux/types.h>
5
6struct device;
7struct dma_attrs;
8struct scatterlist;
9
10/*
11 * Maximum allowable number of contiguous slabs to map,
12 * must be a power of 2. What is the appropriate value ?
13 * The complexity of {map,unmap}_single is linearly dependent on this value.
14 */
15#define IO_TLB_SEGSIZE 128
16
17
18/*
19 * log of the size of each IO TLB slab. The number of slabs is command line
20 * controllable.
21 */
22#define IO_TLB_SHIFT 11
23
24extern void
25swiotlb_init(void);
26
27extern void *swiotlb_alloc_boot(size_t bytes, unsigned long nslabs);
28extern void *swiotlb_alloc(unsigned order, unsigned long nslabs);
29
30extern dma_addr_t swiotlb_phys_to_bus(phys_addr_t address);
31extern phys_addr_t swiotlb_bus_to_phys(dma_addr_t address);
32
33extern int swiotlb_arch_range_needs_mapping(void *ptr, size_t size);
34
35extern void
36*swiotlb_alloc_coherent(struct device *hwdev, size_t size,
37 dma_addr_t *dma_handle, gfp_t flags);
38
39extern void
40swiotlb_free_coherent(struct device *hwdev, size_t size,
41 void *vaddr, dma_addr_t dma_handle);
42
43extern dma_addr_t
44swiotlb_map_single(struct device *hwdev, void *ptr, size_t size, int dir);
45
46extern void
47swiotlb_unmap_single(struct device *hwdev, dma_addr_t dev_addr,
48 size_t size, int dir);
49
50extern dma_addr_t
51swiotlb_map_single_attrs(struct device *hwdev, void *ptr, size_t size,
52 int dir, struct dma_attrs *attrs);
53
54extern void
55swiotlb_unmap_single_attrs(struct device *hwdev, dma_addr_t dev_addr,
56 size_t size, int dir, struct dma_attrs *attrs);
57
58extern int
59swiotlb_map_sg(struct device *hwdev, struct scatterlist *sg, int nents,
60 int direction);
61
62extern void
63swiotlb_unmap_sg(struct device *hwdev, struct scatterlist *sg, int nents,
64 int direction);
65
66extern int
67swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
68 int dir, struct dma_attrs *attrs);
69
70extern void
71swiotlb_unmap_sg_attrs(struct device *hwdev, struct scatterlist *sgl,
72 int nelems, int dir, struct dma_attrs *attrs);
73
74extern void
75swiotlb_sync_single_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
76 size_t size, int dir);
77
78extern void
79swiotlb_sync_sg_for_cpu(struct device *hwdev, struct scatterlist *sg,
80 int nelems, int dir);
81
82extern void
83swiotlb_sync_single_for_device(struct device *hwdev, dma_addr_t dev_addr,
84 size_t size, int dir);
85
86extern void
87swiotlb_sync_sg_for_device(struct device *hwdev, struct scatterlist *sg,
88 int nelems, int dir);
89
90extern void
91swiotlb_sync_single_range_for_cpu(struct device *hwdev, dma_addr_t dev_addr,
92 unsigned long offset, size_t size, int dir);
93
94extern void
95swiotlb_sync_single_range_for_device(struct device *hwdev, dma_addr_t dev_addr,
96 unsigned long offset, size_t size,
97 int dir);
98
99extern int
100swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t dma_addr);
101
102extern int
103swiotlb_dma_supported(struct device *hwdev, u64 mask);
104
105#endif /* __LINUX_SWIOTLB_H */